Messages in this thread Patch in this message | | | From | Alex Shi <> | Subject | [RFC PATCH] sched: select_idle_sibling macro optimize | Date | Wed, 15 Jan 2014 22:23:28 +0800 |
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If the sd domain just has one group, then we must be caught the i == target later, and then goes to deeper level domain. So just skip this domain checking to save some instructions.
Signed-off-by: Alex Shi <alex.shi@linaro.org> --- kernel/sched/fair.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c7395d9..3265fbc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4196,6 +4196,11 @@ static int select_idle_sibling(struct task_struct *p, int target) sd = rcu_dereference(per_cpu(sd_llc, target)); for_each_lower_domain(sd) { sg = sd->groups; + + /* skip single group domain */ + if (sg == sg->next) + continue; + do { if (!cpumask_intersects(sched_group_cpus(sg), tsk_cpus_allowed(p))) -- 1.8.1.2
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